38 Installer’s Guide
Display Code Diagnostic Description
1 Long Run Time
2 System Pressure Trip
3 Short Cycling
4 (L4) Locked Rotor
5 (L5) Open Circuit
6 (L6) Open Start Circuit
7 (L7) Open Run Circuit
9 Low Secondary Voltage
11 Failed ignition
12 Low flame sense current
13 Flame lost after established
14 Flame present with gas valve off
21 (L21) Low Pressure Switch Trip
22 Main limit switch open.
23 Auxiliary limit switch open
25 Condensate Overflow
26 Line Neutral Reversed
27 Check Line Voltage
Display Code Diagnostic Description
28 High Line Voltage
29 (L29) High Pressure Switch Trip
30 Fuse Open
33 MRLC Open
44
Low pressure switch closed,
inducer off
45
Low pressure switch open,
inducer on high speed
46
Low pressure switch open,
inducer on low speed
55
High pressure switch closed,
inducer off
57
High pressure switch open,
inducer on high speed
60 Blower Fault Run
61 Blower Fault No Run
62
Check inducer motor and indoor
blower motor
66 RPM out of range (over 1200 RPM)
68 No Blower Communication
SYSTEM FAULT CODES
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